Blender Git Loki

SCons updates
* OpenAL support is now available on Linux. By default this feature is
disabled since it is only necessary when building the game engine. And the
game engine is disabled by default as well, so...
* Added 3 configurable options to config.opts. These apply to OpenAL settings.

NOTE: remove your current config.opts file to get the new options. (remember
your current settings though ;) )

2nd NOTE: All options* are now configurable via the config.opts file. If the
default settings for your platform are not correct, you should be
able to only update the config.opts file.
* FMOD is still not available - and I do not know if it is necessary to
enable this feature.